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Old 05-12-2008, 04:24 PM   #31
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If your TJ's issue is from lugging the engine from engine RPMs being too low, going to 33" tires will just make it a lot worse. But if you regeared to 4.88 with those 33" tires, your TJ would be transformed by the lower ratio that raised your engine RPMs slightly higher than what you have now. By transforming, I'm saying you'd be amazed at how much better it drove without the engine lugging problem you're experiencing. I know you don't want to regear for cost reasons but doing so can work wonders for performance issues. Heck I've had to regear my TJ twice now so yes it is expensive.

But this is all conjecture, it's hard to know if your problem is caused by low engine rpms (the lugging) without actually driving it. It sounds like it is, that is for sure.

if your talking the tires making it worse and its because of engine lugging? how come I did not have this problem when I had the same size tires with a 2'' lift? plus it goes away then I drive with the front shaft with the rear taken out..

it has to be the driveline but, my angles as you san see are near perfect..

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Old 05-12-2008, 05:00 PM   #32
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if your talking the tires making it worse and its because of engine lugging? how come I did not have this problem when I had the same size tires with a 2'' lift? plus it goes away then I drive with the front shaft with the rear taken out..

it has to be the driveline but, my angles as you san see are near perfect..
Vibes are extremely difficult to diagnose without driving the Jeep, which is why I said in that earlier thread answering Chiro2736's "hijack" that it just seems like his problem might just be his engine lugging. Your symptoms seem to be a little different from his so what I was suggesting to him are just based on his slightly different symptoms.

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Old 05-12-2008, 06:09 PM   #33
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do you have a rear adj. trackbar installed?

a friend had some vibes with his CV diveshaft when the axle wasn´t centered. wih the adj. trackbar the vibes were gone.
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Old 05-12-2008, 07:52 PM   #34
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Yes nico,

i got a Re track bar with bracket.. I measured the axel choosing points to measure it. its looks straight to me.. unless there is another way to measure or center it.

O and what is your rpm at with 4.56 gears at 60 mph?
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Old 05-12-2008, 08:46 PM   #35
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maybe I missed it but did you set your front pinion angle also? possible front DS vibes?
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Old 05-12-2008, 08:56 PM   #36
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pinion is good in the front.. I took out the rear DS and had no vibes.
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Old 05-12-2008, 10:32 PM   #37
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possible signs of impending pinion bearing failure?
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Old 05-13-2008, 02:21 AM   #38
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possible signs of impending pinion bearing failure?
if its a pinion bearing, it would happen consistantly, not a certain mph.

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